Grinding mechanism



r 1,635,792 July 12, c B KELLER 4 GRINDING MECHANISM Original Filed July 7. 1925 6 (was: 3mm Muse,

53 LMZW- Patented my 12,1927. y .W A 1,635,792 I P A'TENT CHARLES. BERNARD KELLER, or s smr w mammal essence s new me am or saala ewrtrsa srtveale J swam memes. e rl e efi s eanna; serial t e19 se -w tr 2 4.

I .My invention relates to portable mechafeatures of construction, and arrangement nism which may be .,,advantageous y 1 h'ereinaffter more definitely specified. ployed in surfacing floors, particularly for In'said drawings Iisa plan view finishing hard wood floors, although adapted of a convenient :term cl my invention arfor use upon floors 'of other materials. ranged to hold a' cylindrical surfacing tool Ordinary floor surfacing machines and the in its operative positiom with its ah-is'paraltools .empl yfifil he n, fife 0 large that it lel' with'the floor being surfaced; such tool c, is impossib l to utilize the same to finish beingreversible to project from either side 7 gtloors in the eorners and'na rrowportions off of said machine frame," as indicated respec- 10 room Consequently, the usev oi such inatively'in full and dotted lines. I

chines must be supplemented by hand work Fig. 11 is a plan view of the same ma- 7 to finish the portions ofthe floor whichafe chine=laid on its side, with another surfacrendered inaccessible by the bulky iiorm of ing tool, having a planu-lar disk abrading such machines. Therefore, it is the object surface carried by ashaft withits airis per Y15 and effect ofmy invention to provide a e icu1 1 V p grinding mechanism capable otpresenting Fig'III is a vertical sectional view or" the abrading to ls, i t

chclose relation'with disk surfa cingtool shown in Fig. 11. the edges of afioor that ,the floor surface Referring to Figs l and H; the L-shaped may b h i fl finished therewith frame 1 is convemently formedof cast metal 2o throughout substantially its entire extent. comprising aplane eh having stiflening It is characteristic of my imp ve il flanges Qand 3 at the opposite longitudinal anism' that it is pable of operating sur- "edges thereof; The electric motor 5 is facing tools of both cylindrical and planir mounted upon said frame web 1 with which la'r form, in alternation; such tools being it is rigidly eonnected by the bolts 6 and 7 9,5 vid d with shafts -whi hare adapteditor which extend through the slots 8 in the interchangeable connection with the mechamotor foot flanges 10 and 11 in screw th-radnism i0: rotating them and such mechanism ed engagement with the bosses-13 and 14in being capable ofsupporting and driving said frame. I provide said motor 5 with such shafts alternatively parallel with and ;the belt tightening device which includes the o 30 perpendicular to the floor. bolt 16 and jam nut 17 in adjustable screw "I he form ,of my invention hereinafter dethreaded relation with the lug l8 onthe web scribed is so compactly arranged that it is of said frame 1. readily portable byone operator, for use in Said motor, 5 has, rigidly connected with alternately presenting a cylindrical abradits armature sha ft l9, the grooved belt wheel '35 .i-ng tool anda plane disk abrading tool in 20 which is operatively connected by the operative relation with the floor or upon belt 21 with the grooved belt wheel 23 which stair treads or risers. I l c w is detach'ably' mounted upon an interchange- That form of my invention includes a able tool shaft 24, conveniently by meansoi trams having fij'QliIinal in which such tool the set screw 25 in the hub 26 of said pul- 4 0 shafts may be interchangeably mounted, ley 23. Said shaft 24' is mounted to rotate andcarrying an electric motor with means infthe' pair of journal bearings 29 and 30 torrotating such shafts. Such frame is not at the end of said frame 1-; which are cone only pr'ovided'with distinct, different, base veniently providedwith the grease cups -31 members whereby it may be supported upon and 32, However, a single long journal thegfioorin eitherof the'ftwo positions aforemay be substitutel for said pair of short hut isconveniently provided with disjournals, and be provided with a single tinctspring pres'sed means for uplifting the gr-ease" cup or other' means r01 il'ubricatiqn ahrading surface of the tool from the floor thereof; e in either or said positions. The operator; As shown "in F1g,'l:; said shaft 24 has,

50 g nay readily depress said frame at the end rigidly mounted thereon, a solid circular carrying the aler ading tool so as to put the surfacing tool body 33 conveniently formed latter into any desired degree of engageasa metal tubet rghtly fittingtsa d shaft 24.

nept with the gfloor, for coarsely or finely Said tool body33 is iaced'with a resiliently finishing thelatter. yielding tube; conveniently formed of; sheet 65 My invention includes "the various novel. fielt material 34; wh ch issink):mindedb3; :the ue lit abrasive tool cover cou'iprising a flexible web carrying a granular abrasive substance.

J\S indicated in Fig. I; the position of said shaft Qtlmay be reversed so as to present said tool body at either side of its journal in said frame 1 as may be most convenient to present the abrasive surface thereof to the surface which is to be ground or polished. As above noted; such a cylindrical tool 33 is deiz'igned for use with its axis parallel with the surface worked upon. which is indicated by the dash line at the top of Fig. II. Said tool 33 is arranged to be normally raised from contact with such surface by the plunger having the head 35 adapted to slide upon such surface, and the shank 3t; titted to reciprocate in a suitable plunger socket in said frame Tl: said plunger being encircled by the spring Eli" which continually tends to uplift said tool 33 in idle spaced relation with the surface to be worked upon, as indicated .in Fig. ll; such niovei'nenl being; limited by screw threads and nuts 38 on said plunger 37.

llmvevcr, said 'lrame 1 may be pressed toward the floor or other surface upon which the plunger head 35 is presented, as in Fig. II, by means of the handle which is rig idly connected with the boss 4:0 on said frame 1. by the screw 42. In such movement; said t'ramc 1 is supported by and arranged to tilt upon base mci'nbers including the rollers 43 and let which are provided with suitable housings connected with the bracket extension o'l' said flange? of the frame l which is L-shapcd. Said tool 33 is thus maintained with its axis parallel with the Sl'll'flttt! upon which said plunger head and rollers 43 and 4d: rcst. at indicated by the dash line in Fig. ll. and said tool 3?) is thus movable toward and away from such surlace upon the common axis of said rollers til and il-4: said spring Pitt instantly uplifting said tool to idle spaced relation with such surface whenever the operator relieves the pressure upon said handle 39. it may be observed that said base members, inch'ldina said rollers 411} and 44 and said plunger 37. permit the mecha- J'llt'Slll to be treaty shifted to and fro upon the surface parallel with the axis of said tool 353. with the minimum amount of exertion by the operator; whether said tool 33 is pressed. into surfacing position or not. find it preferable to rotate said tool so as to lift: the particles oilflooring which it loosens by its abrai'ling" operation; rather than to push them down toward the surface being worked upon. In other words; it is preferable to have the abrading surface oi the tool 32; moving upon the floor surface in the direction in which the machine is being progressed. Therefore. the crossed relation of the belt shown in the drawings may be reversed, at the will of the operator; in accordance with the direction in which it is most.

convenient to progress the frame 1 with reference to the surface operated upon. OE course, such adjustment of the belt may be readily ell'ected by loosening the set, screw 95 so that the tool shaft :24; may be with drawn. It is to be particularly noted that the same length of belt is required to drive the abrading tool in either direction.

ilran'ie l; the outward n'ioyeu'ient. ol said plunger being limited by screw threads and nuts 51 thereon. Said base mcn'iber 4-8 cooperates with the pair of base members at the opposite end of. the frame 1, including the rollers 52 and 52} n'ionntedin suitable housings connected with said frame. As indicated by the dash line in Fig. l; said plunger spring eltl normally nplilts the frame 1 so that the tool it? would be suspended in idle spaced relation with the surface indicated by that line but may be depressed to the position shown in Fig. III by the same handle 39; such rocking motion being with rct'erei'lce to the connnon axis of said rollers 52 and 53. It is to be particularly noted that said handle 39 is so located that the'o ierator may directly apply pressure upon said frame 1 bctwccn said axis and the abradiup, tool, so as to directly press the lat ter against the surface worked upi n, with a 'l'orce which is limited only by the strength ol? the oymrator.

As shown in b ip. ll; the tool slialtz 55 interchangrcablc with said tool shaft .24 in the same journal hearings in said triunc l. As shown in Fig. ll]: said tool shall, 55 is rigidly connected with the hub .56 of the suri'acing t ol at? ciunprisiug a circular body having). a plane 'l'acc. carnving the resilient material 537 which. like the material 34:. may be sheet lelt, which rsilicntly supports the abrasive cover lid which includes a web of. flexible material such as emery cloth or sand paper carrying granular abrasive material. tiluch cover 58 ma y be ramvt-miently secured by the annular band lit) formed at a helical. coil ol' spring: wire which presses the edges of said cover into the groove 60 in said tool 47. "l-lowcver. any suitahlomcans may be can ploycd for providing an abrasive surface upon the tools descriluu'l. For instanci, the tool. body 33 mayhave a slot (52 cut spirally in its cylindrical surface to receive the ad joining edges of an abrasive web, for instance, emery cloth or sand paper. which may be held therein by the plate 63 connected with said tool body by screws 64.

It may be observed that the arrangement shafts 2st and 55 permits more compact arrangen'ient of said mechanism so as to facilitate the projection of both tools 33 and 47 into regions which would otherwise be inaccessible. a

It may be observed that although said cylindrical tool 33 may be presented close to the edge of a rectangularfloor; it would be practically impossible to surface the floor completely to the edge thereof with such a tool because of the liability of scratching the baseboards. llherefore,I find it preferable not to attempt to usesuch tools so close to r the floor edge and to finish the floor surface ing with the tool 47 which may be safely presented up against the baseboards.

Although I have found it convenient to employ the form of my invention above described, I do not desire to limit myself to the precise details of construction and arrangement thereof, as it is obvious that various modifications may be made-therein without departing from the essential features of my invention, as defined in the appended claims.

I claim:

1. In a portable surfacing machine, arranged to interchangeably operate rotary abrasive tools with their axes parallel with and vertical to the floor; the combination with a frame having a journal for the r0- tary shaft of such a tool, and having different base members, respectively arranged to support said frame with the axis of said journal alternatively parallel with, and perpendicular to, thefloor; of means arranged torotate the tool shaft, including an electric motor on said frame, a belt wheel rigidly connected with the motor armature shaft; a belt wheel rigidly connected with a tool I V shaft; and a belt connecting said wheels.

2. The combination with interchangeable floor surfacing tools respectively provided with shafts of the same size and with abrad ing surfaces which'are respectively cylindri cal and planular; of means arranged to alternatively rotate said tools, including a frame having a journal in which said tool shafts may be interchangeably fittedga belt wheel having means arranged to delachably secure it upon the tool shaft in said journal; an electric motor rigidly connected with said frame and having an armature shaft provided with abelt wheel; a belt operatively connecting said wheels; and base members on said frame arranged to support said frame in sliding relation with the floor with the axis ofsaid journal alternatively parallel with and perpendicular to the floor. 3. In a portable surfacing machine, the combination with a, frame; of an abrading tool havinga shaft mounted to rotatein said frame, at one end thereof; an electric motor arranged to rotate said tool; supporting rollers on said framehaving their axes at right angles to each other and arranged to support said frame with the axis of said tool alternatively parallel with and perpendicular to the surface worked upon; and a handle on said framebetween said tool and said supporting rollers; said handle extending obliquely with respect to the axes of both of said rollers; whereby the operator may apply pressure to said handle to forcibly press said tool against the surface worked upon, in both of said alternative positions. 4. In 'auportable surfacing machine, arranged tointerchangeably operate rotary abrasive tools with their parallel with and vertical 'to thefloor; the combination with a frame having-a journal for the re tary shaft of such a tool, and having different base members, respectively arranged to support said frame with the axis of said journal alternatively parallel with, and perpendicular to, the floor; of means arranged to rotate said tool shaft. 7

In testimony whereof, I have hereunto signed my name at Philadelphia;Pennsyle Vania, this second day of July,1925.

, CHARLES BERNARD KELLER. v 

